Apparently not content with simply brewing his coffee to perfection, Alex Campbell can actually take control of the roast itself thanks to his beautiful fluid bed roasting rig.

His DIY device is constructed using a variety of stainless steel and aluminum components, along with a transparent roasting chamber. A spa blower is employed to suck waste out and agitate beans during the process.

The machine’s heating element is driven by a solid-state relay and a thermocouple provides feedback. An Arduino board is tasked with controlling the system, while user interface and higher-level control are handled via a laptop linked to it over serial. 

It’s an amazing design as seen in the two videos below — all to get that perfect cup!